What are the potential pitfalls of relying on timestamps in image URLs for cache control in PHP?

Relying solely on timestamps in image URLs for cache control in PHP can lead to inconsistent caching behavior, as the timestamp may not always accurately reflect changes to the image. To ensure proper cache control, it is recommended to use HTTP headers such as "Cache-Control" and "Expires" to explicitly set caching rules for images. 

// Set caching headers for images
header("Cache-Control: max-age=3600, public");
header("Expires: " . gmdate('D, d M Y H:i:s', time() + 3600) . ' GMT');

Keywords

timestamps image URLs cache control PHP pitfalls

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